中文摘要：

本文针对利用窗函数设计法设计FIR滤波器时所遇到的一些常见问题，例如如何理解吉布斯效应、加窗后的FIR低通滤波器幅度函数特性与IIR滤波器的区别、怎样理解阻带频率和阻带最小衰减、如何进行FIR滤波器指标验证以及利用窗函数法设计线性相位FIR高通滤波器等问题，结合实验设计举例进行了较为详细的讨论和Matlab仿真分析，帮助学生拓展对相关问题的思考，加深对窗函数设计法的理解和应用。

英文摘要：

For the use of the design method of FIR filter encountered some common problems with window function design method, such as how to understand the Gibbs effect, the difference between windowed FIR low pass filter amplitude function characteristics and IIR filter, how to understand the stopband frequency and minimum stopband attenuation, how to verify the FIR filter parameters, using window function method to design linear phase FIR high pass filter is only by type 1 filter, etc, combined with the design example in experiment, a detailed discussion and Matlab simulation analysis are carried out to help students develop the thinking about the related problems and deepen the understanding and application of the window function design method.